15216091 has 8 divisors (see below), whose sum is σ = 16628400. Its totient is φ = 13808640.

The previous prime is 15216079. The next prime is 15216143. The reversal of 15216091 is 19061251.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15216091 - 2⁵ = 15216059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15216001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9475 + ... + 10963.

It is an arithmetic number, because the mean of its divisors is an integer number (2078550).

Almost surely, 2^15216091 is an apocalyptic number.

15216091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15216091 is a deficient number, since it is larger than the sum of its proper divisors (1412309).

15216091 is a wasteful number, since it uses less digits than its factorization.

15216091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 15216091 is about 3900.7808192720. The cubic root of 15216091 is about 247.7998460924.

It can be divided in two parts, 152160 and 91, that added together give a palindrome (152251).

The spelling of 15216091 in words is "fifteen million, two hundred sixteen thousand, ninety-one".